Allow setting CRT's ABI when compiling with MSVC

[ahmedyarub]

Based on: https://cmake.org/cmake/help/git-stage/variable/CMAKE_MSVC_RUNTIME_LIBRARY.html

[OlivierLDff]

I'm not using Qaterial as shared library but what does it fix? Isn't something the user should choose when doing cmake configure command? Is it still possible to overwrite CMAKE_MSVC_RUNTIME_LIBRARY with MultiThreadedDLL if needed?

[ahmedyarub]

I'm not using Qaterial as shared library but what does it fix? Isn't something the user should choose when doing cmake configure command? Is it still possible to overwrite CMAKE_MSVC_RUNTIME_LIBRARY with MultiThreadedDLL if needed?

I have an application that uses Qaterial along with other vcpkg libraries compiled using the triplet x64-windows-release. In that triplet a static CRT is used, which cannot be mixed with Qaterial's shared CRT. Setting CMAKE_MSVC_RUNTIME_LIBRARY is an option but for that we would still need to increase the minimum CMake version. Do you want me to just increase the CMake version without adding this logic?

[OlivierLDff]

Why do you need to increase the mnimum version? It doesn't work if you just use cmake v3.15?

[OlivierLDff]

For example Qaterial use precompiled headers, that are cmake 3.17 feature. It is only enabled if target_precompile_headers command is available. But if in your case it is not taken into account, then yes increase minimum version. Ubuntu 20 is shipped with cmake 3.16. So that's ok

[ahmedyarub]

Done

[ahmedyarub]

For example Qaterial use precompiled headers, that are cmake 3.17 feature. It is only enabled if target_precompile_headers command is available. In this case using a minimum version lower than 3.15 sets a policy that ignores default runtime flags.